/Engine/Plugins/Experimental/Water/Source/Editor/Public/CausticsGeneratorActor.h
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Water Mesh Preview") void SpawnWaterPreviewGrid ( [UHierarchicalInstancedStaticMeshComponent](API\Runtime\Engine\Components\UHierarchicalInstancedStaticMesh-) * HISMC, float GridSize, int GridTiles )